SmartBoa: Constructing p2p Overlay Network in the Heterogeneous Internet Using Irregular Routing Tables

摘要

The high heterogeneity of large-scale p2p system leads us to the philosophy that the size of a node's routing table and its updating cost should correspond to the node's capacity. With this philosophy, we design a novel structured overlay: SmartBoa. SmartBoa categorizes nodes into different levels according to their capacities. A node at level k has a routing table with N/2~k entries (N is the system scale). An efficient non-redundant multicast algorithm is introduced to distribute nodes' changing reports. With the multicast the routing table's updating cost is in proportion to its size. Node can change its level freely so as to adapt to fluctuation of the system. At the same cost as the O(log N) overlay, SmartBoa maintains with much larger routing tables and has much higher routing efficiency. A low-bandwidth (64 kbps) node can maintain 10,000 routing entries at the cost of only 10 percent of its bandwidth. Without the high bandwidth requirement of an one-hop overlay, SmartBoa is much more scalable.